おく
inner part, back (of...)
The scissors were at the very back of the drawer the whole time, behind an oak おく box nobody has opened in years: おく.
Same sound as 置く おく, 'to put'. 奥 is the depths of something. And 奥さん is somebody's wife. 背中 せなか is the back on your body.
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Emaki is not affiliated with, or endorsed by, Kaishi 1.5k or its authors. The word, reading and meaning come from the Kaishi 1.5k deck, used with their permission. The mnemonic, the note and the kanji breakdown are original work, published under CC BY-SA 4.0.